/*
* Licensed under the MIT License
* 
* Copyright (c) 2010 Kay Kreuning
* 
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* 
* http://code.google.com/p/as3hyvesapi
*/
package nl.hyvesstudio.oauth.signing
{
	import com.adobe.crypto.HMAC;
	import com.adobe.crypto.SHA1;
	
	import nl.hyvesstudio.serialization.Base64;
	import nl.hyvesstudio.utils.URLUtil;

	public class SignatureMethod_HMAC_SHA1 implements ISignatureMethod
	{
		/** @inheritDoc */
		public function get methodName():String
		{
			return "HMAC-SHA1";
		}
		
		/** @inheritDoc */
		public function calculateSignature(parameters:Object, endpoint:String, consumerSecret:String, tokenSecret:String, httpMethod:String = "GET"):String
		{
			var message:String = encodeURIComponent(httpMethod) + "&" +
				encodeURIComponent(endpoint) + "&" + 
				encodeURIComponent(URLUtil.decodeToGetVariables(parameters));
			
			var hash:String = HMAC.hash(
				encodeURIComponent(consumerSecret) + "&" + encodeURIComponent(tokenSecret),
				message,
				SHA1);
			
			return Base64.encodeBigEndian(hash);
		}
	}
}